Sure do. Go into the stbd side of your aft/mid cabin (under the helm). Access the large space behind the side seatback cushion. In the aft portion of that hole, you will see an ~8inch access plate (circular)...behind that is the water heater. You will need a flashlight to see, but on the right side of the heater, bottom, is the valve to open the drain (also on the upper right is the relief valve to allow air in). It will drain into the bilge under the cushions in the aft/mid cabin area.
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Dream 'Inn III -- 2008 400 Express